java生成动态gif格式与png格式的验证码(代码5)

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
 * 流操作类
 * @author wzztestin
 *
 */
public class Streams {
	/**
	 * 关闭输入流
	 * 
	 * @param in
	 *            输入流
	 */
	public static void close(InputStream in) {
		if (in != null) {
			try {
				in.close();
			} catch (IOException ioex) {
				// ignore
			}
		}
	}

	/**
	 * 关闭输出流
	 * 
	 * @param out
	 *            输出流
	 */
	public static void close(OutputStream out) {
		if (out != null) {
			try {
				out.flush();
			} catch (IOException ioex) {
				// ignore
			}
			try {
				out.close();
			} catch (IOException ioex) {
				// ignore
			}
		}
	}
}

 

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.microcare.framework.logs.Logit;

/**
 * 新的验证码
 * @author wzztestin
 *
 */
public class NewYanZHengMa extends HttpServlet {
	/**
	 * 
	 */
	private static final long serialVersionUID = -1434521774502002007L;

	private static String AUTH_CODE_KEY = "fraudrand";

	public void init() throws ServletException {
		super.init();
	}
	
	/**
	 * 生成验证码
	 */
	@SuppressWarnings("static-access")
	public void doGet(HttpServletRequest request, 
			HttpServletResponse response) throws ServletException, IOException {
		response.setHeader("Pragma", "No-cache");
		response.setHeader("Cache-Control", "no-cache");
		response.setDateHeader("Expires", 0);
		response.setContentType("image/jpeg");
		Captcha captcha = new GifCaptcha(150,40,5);
		captcha.getVilidCode();
		int svalue = 0;
		if("+".equals(captcha.getCzfu())){
			svalue = Integer.parseInt(captcha.getOnenum()) + Integer.parseInt(captcha.getTwonum());
		}else{
			svalue = Integer.parseInt(captcha.getOnenum()) - Integer.parseInt(captcha.getTwonum());
		}
		setAuthCode(request, svalue+"");
		Logit.errorLog("newyzm "+this.getAuthCode(request));
		ServletOutputStream out = response.getOutputStream();
        captcha.out(out);
        out.flush();  
        return;
	}
	
	/**
	 * 得到验证码的值
	 * @param request
	 * @return
	 */
	public static String getAuthCode(HttpServletRequest request) {
		String result = null;
		if (request == null) {
			Logit.errorLog("request is null!");
			return result;
		}
		HttpSession session = request.getSession(false);
		if (session == null) {
			Logit.errorLog("session is null!");
			return result;
		}
		if (session.getAttribute(AUTH_CODE_KEY) != null) {
			result = (String)session.getAttribute(AUTH_CODE_KEY);		
		}
		return result;
	}
	
	/**
	 * 把值存入session中
	 * @param request
	 * @param authCode
	 */
	public static void setAuthCode(HttpServletRequest request, String authCode) {
		if (request == null || authCode == null) {
			Logit.errorLog("request/authCode is null!");
			return;
		}
		HttpSession session = request.getSession(true);
		if (session == null) {
			Logit.errorLog("session is null!");
			return;
		}
		session.setAttribute(AUTH_CODE_KEY, authCode);		
	}
	
	/**
	 * 移除验证码
	 * @param request
	 */
	public static void removeAuthCode(HttpServletRequest request) {
		if (request == null) {
			Logit.errorLog("request is null!");
			return;
		}
		HttpSession session = request.getSession(false);
		if (session == null) {
			Logit.errorLog("session is null!");
			return;
		}		
		session.removeAttribute(AUTH_CODE_KEY);
	}
}